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U12FA00 — Comfort CAN bus 2 - no communication

Comfort CAN bus 2 - no communication. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne report this code; below is which control unit sets it on each model and how to read and clear it.

Which models and control units set U12FA00

Porsche Taycan

Air ConditioningGateway

Porsche 911 (992)

Lift VA (Lift Vorderachse)Gateway

Porsche Panamera (971, 2017–2023)

Air ConditioningGateway

Porsche Panamera (972, 2024–)

Air ConditioningGateway

Porsche Cayenne (9YA)

Air ConditioningGateway

How to read and clear U12FA00

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and U12FA00 shows with its status, its full description and the freeze frame when the unit stores one.
  3. Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.

More about fault memory in the manual →

Download STEUER14 — free fault reading

Other codes of the Air Conditioning

U124F00Electric auxiliary heater (12V) - message implausible
U129000Servo motor for rear right air distribution - no communication
U129100Servo motor for rear right air distribution - message implausible
U12F100Rear A/C Control Head 1, no communication
U12F200Rear A/C Control Head 2, no communication
U12F900Comfort CAN bus 2, faulty
U132900Front sun sensor - message implausible
U132A00Front sun sensor - no communication
U132B00Servo motor for extended ventilation panel - message implausible
U132C00Servo motor for extended ventilation panel - no communication
U132D00Left air vent cover motor, no communication
U132E00Servo motor for design trim, left - message implausible

All 418 codes of this control unit →

Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.